[turbofan] Don't compute unneeded gray set in AllNodes.

src/compiler/node.h

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_COMPILER_NODE_H_
 #define V8_COMPILER_NODE_H_
 
 #include "src/compiler/opcodes.h"
 #include "src/compiler/operator.h"
 #include "src/types-inl.h"
@@ skipping 231 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(Node);
 };
 
 
 std::ostream& operator<<(std::ostream& os, const Node& n);
 
 
 // Typedefs to shorten commonly used Node containers.
 typedef ZoneDeque<Node*> NodeDeque;
+typedef ZoneSet<Node*> NodeSet;
 typedef ZoneVector<Node*> NodeVector;
 typedef ZoneVector<NodeVector> NodeVectorVector;
 
 
 // Helper to extract parameters from Operator1<*> nodes.
 template <typename T>
 static inline const T& OpParameter(const Node* node) {
   return OpParameter<T>(node->op());
 }
 
@@ skipping 215 matching lines @@
 
 void Node::ReplaceInput(int index, Node* new_to) {
   GetInputRecordPtr(index)->Update(new_to);
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_NODE_H_